Sorry can anyone help me, what is the mathematical formula for Ks Kb and Kw constants ?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Are oil and water a mixture or solution

Is 343 in the sequence -5, -2, 1, 4, 7